Abstract
A continuing project at the Center for NDE in Ames involves the development of models which predict the probability of detecting flaws using a given inspection system.[1] Our general approach as it applies to through-transmission immersion inspections is as follows. With the two transducers to be used in the inspection, a reference experiment is performed to determine relevant information concerning equipment characteristics and transducer efficiencies. This may be done by placing a calibration specimen into the ultrasonic beam and measuring the time-domain electrical signal in the output cable of the receiver. Using models, we then predict how this received electrical signal would be changed if the calibration specimen were removed and unflawed and flawed components were placed into the beam in turn. The two components are assumed to have identical geometries except for a hypothetical flaw of given type, size, and orientation. If the difference between the predicted output signals for the two components is sufficiently large, compared to system noise, then the hypothetical flaw is said to be detectable.
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References
T. A. Gray, F. Amin, and R. B. Thompson, Review of Progress in QNDE 7B, D. O. Thompson and D. E. Chimenti, Eds., (Plenum Press, New York, 1988), p. 1737.
F. J. Margetan, T. A. Gray, R. B. Thompson, and B. P. Newberry, Review of Progress in ONDE 7B. D. O. Thompson, and D. E. Chimenti, Eds., (Plenum Press, New York, 1988), p. 1083.
B. A. Auld, Wave Motion 1 (1979), p. 3.
B. P. Newberry and R. B. Thompson, A paraxial theory for the propagation of ultrasonic beams in anisotropic solids, submitted to J. Acoust. Soc. Am.
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© 1989 Springer Science+Business Media New York
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Margetan, F.J., Newberry, B.P., Gray, T.A., Thompson, R.B. (1989). Modeling Ultrasonic Beam Propagation in Graphite Composites. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0817-1_20
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DOI: https://doi.org/10.1007/978-1-4613-0817-1_20
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4612-8097-2
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